There are a few other active/semi-active posters who joined before 2007 and who have under 1000 posts. Every single one of them is a quality poster. So more posts aren't necessarily better. It's the quality of the participation that counts.

loyal
bukaida
SonLight
c'tair
quex

Josso

Nope there are a few, most of them as mentioned are quality posters as well.